Apparatus for constructing artificial tooth-crowns



(No Model.)

A. E. MATTESON.

APPARATUSFOR GONSTRUOTING ARTIFICIAL TOOTH OROWITS. N0. 297;7'03. P-zxfiwilted Apr. 29, 1884.

WITNESSES INVENTOR .flrzizurl'l'flaleson W2 66 By h," flttorneys i I I UNITED STATES I PATEur Grinch.

XARTHURYVE. MATTESON, on oIIIoAGo, ILLINOIS.

APPARATUS FOR CONSTRUCTING ART'lFlCIAL TOO-TH-CRO WNS.

SPECIFICATION forming part of Letters Patent No. 297,703, dated April 29, 1884;

Application filed October 12, 1883. (No model.)

, ods'of Constructing Tooth-Crowns, of which the following is a specification.

My invention relates more especially to pcculiar dies for swaging or striking up artificial tooth-crowns, or the metal portion or shell thereof, shown in my Letters Patent No. 280,052, dated June 26, 1883. In said Letters Patent I have shown a metal tooth-crown shell for incisor teeth, consisting of a concave portion, which forms the lingual surface of the crown, and of a band or loop which encircles and fits over the end of the natural root to which the artificial crown is applied. The front face of the crown is composed of a porcelain plate or 'block, suitably shaped on its face, and grooved at its back to receive the filling material which secures the crown to the root, theporcelain face of the crown being further securedin the metal shellby burnishing or swaging the front edges of the metal shell down upon the edges of the porcelain face or block, or in any other suitable way. I i

In my said Letters Patent I have stated that the shell or metal portion of the crown may be swaged or struck up by suitable dies; and to furnish improved dies for this purpose, and to improve the method of constructing the crowns, I have devised the improvements which are hereinafter particularly set forth and explained.

In the accompanying drawings, Figure 1 is a view of a pair of pivoted jaws carrying dies, which are illustrated as opened ready to receive the blank to be formed. Figs. 2 and 3, respectively, are views in elevation and perspective of the male die detached, and Fig. 4 is a top or plan view thereof. Fig. 5is aview in perspective of the female die. Fig. 6 is a view of the metal blank to be subjected to the swaging action of the dies in order to be formed into a shell or crown, ready for fitting to the natural root. Fig. 7 is a view of the dies closed, in the act of striking up or forming a crownshell, the ring or band-strip of which is shown as bent around the upper anvil-surface of the die, so that when soldered or united at the free end the shell will be completed; and Fig. 8 is a view of the completed crown-shell.

I- will describe one set of dies and the operation of striking up the shell or metal portion of the crown, which will be suffieient to eX- plain my improvements. It will be understood, however, that a complete set of dies for the practical work of a dentist will comprise many dies of different sizes and shapes to meet the requirements of the varying cases he may have in hand. As stated, not only the size of the dies will vary, but the shapes of the faces of the dies will also vary, in order to provide for fitting an artificial crown to any natural root, so as to be in harmony with the adjacent teeth. All the dies making up the complete .set for practical use are interphangeably fitted to the pivoted jaws, forceps, or other pressure-applyingdevice, and may be removed and replaced as occasion requires. The male die a is fitted to the shank a, which is in turn fitted in a socket in thejawbof the forceps B, or other suitable swaging. appa- .sides of the female or cup die 0, which is also mounted upon a shank, c, fitted to the jaw b of the forceps B. The -1nale-die a is formed wit-h a round or curved surface, (1 on its shank or upper side, which constitutes an anvil, around which a narrow strip, (1, of the metal blank D is bent and shaped to form the band or ring of the shell or crown, as will be presently more fully explained.

In operation a suitable blank, D, of thin sheet metal--preferably a compound metal plate of gold and platina, such as fully described and claimed in the application for Letters Patent filed by me September 17 l883- is placed between the dies at c, and pressure is applied to the handles of the forceps to force said dies together. The blank is thus forced by the male die'a into the seat in the face of the cup or female die, a, andthe blank is thus swageol, bent, or struck up into the form shown in Fig. 7. The sw'aging operation, it will be seen, does not complete the formation of the shell, which still requires the formation of the band or loop marked t in Fig. 8, which figure shows the completed shell. The narrow strip (I of said blankDis now bent around the anvil or curved surface a of the male die and hammered or burnished into shape, and the shell is then removed from the die, and the free end of said strip d solderedto the side of the blank, so as to complete it, as shown in Fig. 8, except as to the fitting of the porcelain front. The porcelain front is fitted to its seat in the face of the metal shell, and the edges thereof burnished or swaged down upon the edges of said porcelain front, as fully described in my aforesaid patent, and as recited above.

I claim as my invcntion- 1. A die for swaging artificial-tooth-crown blanks, having a face shaped to give form to the metal crown-blank, and also having an an vil-surface opposite the face of the die, around which a portion ofthe blank is bent or formed, substantially as described.

ARTHUR E. MATTESON.

Vitnesses:

GEORGE C. FRY, SEWALL \V. ABBOTT. 

